I wonder if it would be possible to install a grease nipple to these arms so the ball joints could have a proper dose of grease?
If a small hole was drilled from the underside of the ball joint and a self tapping style grease nipple installed.
I know the rubber could be lifted before installation to put some grease in but if the grease came in from the underside it should make these last longer.
I think I have a spare arm, I will have a look to see if it is a workable idea.
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